MPC + ffdshow, for many reasons :
-very fast to open and plays instantly(foobar is slow)
-very small GUI(foobar GUI is HUGE)
-enables me to decode mp3 in 32 float, process DSP in 32float, and send 32 float to my soundcard drivers(I leave it to them to convert to integer)...yada yada it doesn't matter, I find it sounds WAY better than foobar's mp3 decoder w/ 16/24 integer DSP

ffdshow works w/ winamp2/DX plugins(through the FFX-4 wrapper), but no VST...because the VST bridge sweeps